The live connector is where live callers are introduced to other callers greetings, one by one.

What happens after users turn over their credit cards for monthly membership payments (or after they listen to ads on one of the growing number of free sites) is largely left to chance -- and users are generally good about taking precautions, Brooks and others in the industry said.

"People arrange to meet at your place or mine," said Jonathan Crutchley, chairman and founder of Manhunt.com, which operates gay-oriented phone and Web chat services. There have been some murders." Although Crutchley said that nearly all of his customers had reported no problems, his site was linked to a 2003 case in Provincetown, Mass., in which a man who killed a lover had met sex partners online.

Both male and female callers dial in and through a common access number.

As soon as a caller is connected into the system, he is prompted to record his name and a brief greeting describing himself and what he is looking for.

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Here at the 2017 Philadelphia Science Carnival, visitors take part in a deep sea coral Build*Draw*Learn station. ECOGIG marine scientists from Temple University talk about the tools they use to collect information about deep water ecosystems.